INT-842 moved gateway support base classes to core gateway package

org.springframework.integration/src/main/java/org/springframework/integration/gateway/AbstractRemotingOutboundGateway.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2002-2010 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.integration.gateway;
+
+import java.io.Serializable;
+
+import org.springframework.integration.core.Message;
+import org.springframework.integration.core.MessageChannel;
+import org.springframework.integration.handler.AbstractReplyProducingMessageHandler;
+import org.springframework.integration.message.MessageBuilder;
+import org.springframework.integration.message.MessageHandlingException;
+import org.springframework.remoting.RemoteAccessException;
+
+/**
+ * A base class for outbound URL-based Messaging Gateways.
+ * 
+ * @author Mark Fisher
+ */
+public abstract class AbstractRemotingOutboundGateway extends AbstractReplyProducingMessageHandler {
+
+	private final RequestReplyExchanger proxy;
+
+
+	public AbstractRemotingOutboundGateway(String url) {
+		this.proxy = this.createProxy(url);
+	}
+
+
+	public void setReplyChannel(MessageChannel replyChannel) {
+		this.setOutputChannel(replyChannel);
+	}
+
+	/**
+	 * Subclasses must implement this method. It will be invoked from the constructor.
+	 */
+	protected abstract RequestReplyExchanger createProxy(String url);
+
+
+	@Override
+	public final Object handleRequestMessage(Message<?> message) {
+		if (!(message.getPayload() instanceof Serializable)) {
+			throw new MessageHandlingException(message,
+					this.getClass().getName() + " expects a Serializable payload type " +
+					"but encountered [" + message.getPayload().getClass().getName() + "]");
+		}
+		Message<?> requestMessage = MessageBuilder.fromMessage(message).build();
+		try {
+			return this.proxy.exchange(requestMessage);
+		}
+		catch (RemoteAccessException e) {
+			throw new MessageHandlingException(message, "remote failure in Messaging Gateway", e);
+		}
+	}
+
+}

org.springframework.integration/src/main/java/org/springframework/integration/gateway/RemotingInboundGatewaySupport.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2002-2010 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.integration.gateway;
+
+import org.springframework.integration.core.Message;
+
+/**
+ * Support class for inbound Messaging Gateways.
+ * 
+ * @author Mark Fisher
+ */
+public abstract class RemotingInboundGatewaySupport extends SimpleMessagingGateway implements RequestReplyExchanger {
+
+	private volatile boolean expectReply = true;
+
+
+	/**
+	 * Specify whether the gateway should be expected to return a reply.
+	 * The default is '<code>true</code>'.
+	 */
+	public void setExpectReply(boolean expectReply) {
+		this.expectReply = expectReply;
+	}
+
+	public Message<?> exchange(Message<?> message) {
+		if (this.expectReply) {
+			return this.sendAndReceiveMessage(message);
+		}
+		this.send(message);
+		return null;
+	}
+
+}

org.springframework.integration/src/main/java/org/springframework/integration/gateway/RequestReplyExchanger.java

@@ -26,8 +26,8 @@ import org.springframework.integration.core.Message;
  * @author Mark Fisher
  * @since 2.0
  */
-interface RequestReplyExchanger {
+public interface RequestReplyExchanger {
 
-	public Message<?> exchange(Message<?> request);
+	Message<?> exchange(Message<?> request);
 
 }